1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 NVIDIA Corporation 4 */ 5 6 #include <linux/reset-controller.h> 7 8 #include <soc/tegra/bpmp.h> 9 #include <soc/tegra/bpmp-abi.h> 10 11 static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc) 12 { 13 return container_of(rstc, struct tegra_bpmp, rstc); 14 } 15 16 static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc, 17 enum mrq_reset_commands command, 18 unsigned int id) 19 { 20 struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc); 21 struct mrq_reset_request request; 22 struct tegra_bpmp_message msg; 23 24 memset(&request, 0, sizeof(request)); 25 request.cmd = command; 26 request.reset_id = id; 27 28 memset(&msg, 0, sizeof(msg)); 29 msg.mrq = MRQ_RESET; 30 msg.tx.data = &request; 31 msg.tx.size = sizeof(request); 32 33 return tegra_bpmp_transfer(bpmp, &msg); 34 } 35 36 static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc, 37 unsigned long id) 38 { 39 return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id); 40 } 41 42 static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc, 43 unsigned long id) 44 { 45 return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id); 46 } 47 48 static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc, 49 unsigned long id) 50 { 51 return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id); 52 } 53 54 static const struct reset_control_ops tegra_bpmp_reset_ops = { 55 .reset = tegra_bpmp_reset_module, 56 .assert = tegra_bpmp_reset_assert, 57 .deassert = tegra_bpmp_reset_deassert, 58 }; 59 60 int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp) 61 { 62 bpmp->rstc.ops = &tegra_bpmp_reset_ops; 63 bpmp->rstc.owner = THIS_MODULE; 64 bpmp->rstc.of_node = bpmp->dev->of_node; 65 bpmp->rstc.nr_resets = bpmp->soc->num_resets; 66 67 return devm_reset_controller_register(bpmp->dev, &bpmp->rstc); 68 } 69